function y = e_ep1(x)
%Extended EP1 Function   
%x0=[1.5.,1.5.,...,1.5].  
%fmin=n/2
%Author:shi yangyang
n=length(x);
m=n/2;
y=ones(1,m);
for i=1:1:m
    t1=exp(x(2*i-1)-x(2*i))-5.0;
    t2=x(2*i-1)-x(2*i);
    t3=x(2*i-1)-x(2*i)-11.0;
    y(i)=t1*t1+(t2*t2)*(t3*t3);
end
y=sum(y);